【摘要】 交联聚苯乙烯具有极低的介电常数和介电损耗，是高频通信领域的首选应用材料。随着通信设备尺寸的增加，交联聚苯乙烯的力学性能不能满足大尺寸工件的要求。本工作采用浇注法，将聚丙烯纤维与交联聚苯乙烯复合，制备出纤维增强复合材料。使用谐振腔、万能试验机及扫描电子显微镜，对不同纤维含量及纤维长度下复合材料的介电性能、力学性能、断面形貌进行研究。在5.0 GHz时，复合材料的介电常数从2.52(交联聚苯乙烯介电常数)降低到2.45,介电损耗值为0.001。复合材料弯曲强度比纯交联聚苯乙烯最大提高36.2%,拉伸强度最大提高67.7%,复合材料的储能模量最高达到1 756 MPa,比原始值提高了46.3%。聚丙烯纤维的加入有效提高了交联聚苯乙烯的力学性能。更多还原

【Abstract】 Cross-linked polystyrene has an extremely low dielectric constant and dielectric loss,and is regarded as the preferred application material in the field ofhigh-frequency communication.With the increase in the size of communication equipment,the mechanical properties of crosslinked polystyrene cannot meet the requirements of large-sized workpieces.In this study,fiber-reinfo rced composite were fabricated via the pouring method,integrating polypropylene fibers with cross-linked polystyrene.The dielectric properties,mechanical performance,and fracture morphology of the composites were comprehensively examined under different fiber contents and lengths.A resonator,a universal testing machine,and scanning electron microscopy were employed for these investigations.At 5.0 GHz,the dielectric constant of the composites dropped from2.52(the dielectric constant of cross-linked polystyrene) to 2.45,with a dielectric loss value of 0.001.Compared to pure cross-linked polystyrene,the composite material exhibited remarkable improvements;a 36.2% increase in flexural strength,a 67.7% boost in tensile strength,and a storage modulus reaching 1 756 MPa(46.3% higher than that of the original cross-linked polystyrene).Evidently,the addition of polypropylene fibers significantly enhances the mechanical properties of cross-linked polystyrene.更多还原